Hand rock drill



Oct. 4, 1938. J. c. WRIGHT 2,1315997 HAND ROCK DRILL Filed Dec. 22, 1956 v 3 Sheets-Sheet l IH W I INVENTOR I Jame; C. My 6 Oct. 4, 1938 J c. w f 2,131,997

HAND ROCK DRILL Filed Dec. 22, 1956 5 Sheets-Sheet 2 INVENTOR James C. M/r/gh 6 BY @KEW ATTO Oct. 4, 1938. J. c. WRIGHT 2,131,997

HAND ROCK DRILL Filled Dec. 22, 1956 s Sheets-Shea? s Patented Oct. 4, 1938 v UNITED STATES PATENT OFFICE 6 Claims.

My invention relates to manually operated drilling mechanism for use of miners and the like.

My object is to provide an easily operated and cheaply constructed drill mechanism of this character having manual feeding means, automatic feeding means, and automatic'chuck rotating means. Other objects will appear as the description progresses.

Figure 1 represents a side View of the drill; Fig. 2, a front end view; Fig. 3, a rear end view; Fig. 4, a detail rear view showing a part of the automatic feeding means; Fig. 5, a longitudinal interior view of the drill with the near half of the housing removed; Fig. 6, a fragmentary view showing the locking lug engaging the hammer; Fig. '7, a transverse sectional view on secant line 7-1 of Fig. 5; and Fig. 8, a transverse sectional 'view on secant line 88 of Fig. 1.

housing; manually operated feeding means; a

hammer member; operating means for the hammer member; a steel holding chuck; means to rotate the chuck; automatic feeding means; and disengaging means for the automatic feeding means.

The base I is provided with a pair of guide channels and hinged to a support 4 by hinge members 5 connected by pins 6. The housing 1 is provided with a pair of guide ledges 89 which are disposed in the guide channels. An end member I is secured to the rear end'of the housing 'lbyboltsll. v

The manually operated feeding means comprise an actuating nut l2 provided with a ratchet l3 and disposed in end member [0; a feed screw '14 screwed through the nut l2 and journalled in a vertically disposed bearing plate l5 which is secured to a pair of rods l6 which are secured to the base I; and a. crank I! mounted on the end of feed screw 14 and secured theretoby a nut l8. A manually operated pawl l9 having a knob WA is secured to the plate l5 by a screw 26 and adapted to engage a hexagonal portion 2! on the feed screw I4. A pawl 22 is mounted on a pivot 23 in the end member l0 and is adapted to engage the ratchet l3 to prevent backward rotation of the nut l2.

ing 1.

The hammer member is provided with a spring receiving portion 25; an intermediate portion 26; a hammerhead portion 28, and a guide portion 28A; and is slidably disposed in the housing I. The intermediate portion 26 is provided with a rack 29 and a journal 30. The spring receiving portion 25 is provided with an inclined face 3|, and. the guide portion 28A contains a key 32 which works in a key way 33 in the housing I.

The operating means for the hammer member comprises a spring 34 disposed about the portion 25 of the hammer member within the housing 1 and is compressed by the mechanism now to be described. A roller 35 is mounted on journal 36 on the hammer member. A transversely disposed actuating shaft 36 is journalled in hous- An intermittent gear 3'! is mounted on shaft 36 and is adapted to engage the rack 29 intermittently. An intermittent cam 38 is mounted on shaft 36 and is adapted to cooperate with the roller 35. A piniongear 39 is mounted on shaft 36 outside the housing I. A drive shaft 40 is journalled in the bearings 4| on the housing 1. A spur drive gear 42 is mounted on shaft- 40 and meshed with thepinion 39. A shaft 43 is journaled in bearing 44 on housing 1. A pinion gear 45 is mounted on shaft 43 and meshed with spur gear 42. A fly wheel 46 is mounted on shaft 43. Cranks 'Hl2 are mounted on shaft 40.

A steel holding chuck 4'! is provided with a ratchet 48 and rotatably mounted in the housing 1.

The means to rotate a chuck 41 comprises an eccentric cam 49 mounted on shaft 36; a lever 50 mounted on a stud 5i; and a click mechanism."

The lever 56 is provided with a roller 52 adapted to follow the eccentric cam 49. The click mechanism comprises a hollow stud 53 on the lever 56; a spring 54 disposed in the stud 53; and a end member 10 and provided with a stud 60 upon which a roller 61 is mounted, the roller 6| being disposed against the inclined face 3| of the hammer member; and a pawl 62 mounted on a stud 63 and adapted to engage the ratchet l3.

The disengaging means for the automatic feeding means includes a bell crank having arms 64-55 mounted on a bolt 61 and is adapted to engage a pin 68 on the slide 59. An annular plate 69 is disposed about the feed screw l4 adjacent to the nut l2 and is adapted to be clamped against the nut l2 by the arm 64 of the bell crank. A lever 10' is mounted on bolt 61.

5 For convenience in manufacture and assembling, the housing is divided longitudinally into two parts which are normally secured together by bolts.

A lug 15 is mounted on a shaft 15 journalled in the housing, and a lever 11 is mounted on shaft 16.

In use, the machine is properly located to drill into a rock and the steel S disposed in the chuck and allowed to protrude beyond the chuck into 15 the housing as indicated by x. The .housing which performs the function of a carriage, is adjusted by turning the crank I! which revolves the feed screw l4 within thenut l2 and-thereby moves the housing along the guide channels in the base I. Before the feed screw I4 can be revolved,the;pawlI9 mustbe swung backward to clear the nuteZI. -If the-housing is-to bemoved backward, thelever 10 must be swungbackward so as to disengage the automatic :feeding means and tobrake and lock the nut 12. After the housing has-.beenmanually adjusted, the pawl I9 is swung-back into-position toengage.the nut :Zl to-prevent rotation of the feedscrew |4,:and the lever arm 'IO-is, swung back to normal so as .30 .to permit the inclined face -.3l to operate the .slide.59.

After the m-anual adjustmentshave been made as described thelcranks 71 |-12'- are turned. manually. The drive-gear AZ onshaftMl-engages the 7 actuating pinion-39 on shaft 36 an-d-actuates the cam-38 andzthe intermittent gear. The cam 38 cooperates with the roller- 35 on the hammer mem- -'ber and moves the .hammer member backward against the spring until it-reaches the limit of itsaction, at which time the-intermittentgear engages the rack-29 and drivesthe hammer membervonward against-the spring 34 until-the. intermittent gear .31 leaves therack 29. When the teeth of the intermittent gear clears the'rack 29, the compressed spring .34 forces the hammer members forward, causing it'to strike the end portion a: of the steel with a hammer like blow.

Each time-the hammer member is moved backward, the inclinedface 3| cooperates with the roller 6] and lifts-the'slide 59, thereby'causing the pawl- 62 to rotate-the nut 12 the distance of one tooth of the ratchet l3. When the hammer .member is driven' forward, the slide 59 dropsand the pawl 62 engages the next tooth of the ratchet I 3. The action of the. pawl 62-on the ratchet I 3 screws the nut l2 forward'on the-feed screw l4 and thereby moves thehousing forward.

The eccentric cam 49ton the shaft :36 cooperates-with the-roller 52 on the'lever 50 and moves the thimble' 55 along-the-periphery of the ratchet gear 48. The-thimble '55 being disposed over a spring 54 on a stud' 53,-is, permitted toslide over 'the teeth of ratchet gear 48 on its upward trip but is caused to engage the ratchet teeth on its downward trip and thereby. revolve the chuckthe distance of one tooth of the ratchet gear-48. It will 'be observed-thatthe-rotation of the chuck is accomplished during .the backward movement of "the hammer-member. Thehammer member maybe locked in'the extreme-backward position by swinging lever 11 so as to swing lug l5 into'position inrfront of'the point indicated by 2 on the hammer. member, as shown in Fig. 6. v5 The-steel is disposed slidably in the chuckand (shell; an end member secured to the rear end of said housing; a feed actuating nut mounted on saidi'feed screw within said end member; a ratch- 15 .et onsaid feed actuating nut; a hammer member slidably mounted'in said housing and provided with an inclined "face portion; a vertically disposed slide mounted in said end member and provided with a roller adapted to cooperate with 20 the inclinedface of said hammer-member; antactuating pawl .mounted'on said-.slidesand adapted to engage the teeth of the ratchet on said feed actuating nut;:and--a pin on said .slide;:.a.brake disc mountedon saidrfeed screw adjacentto. said ,25

. feed actuating nut, a transversely disposed .bolt .mountedinsaid housing; a bell crankmounted on said .loolt and-adapted to cooperate with said brake disc to brake said feedactuating nut andto cooperate with. saidpinto. lift said.,-slide; a. lever 30 mounted on-said bolt outside said housing.

:2. Ina rock. .drill, the combination-of a, guide shell; a housing slidably mounted onsaidguide shell; a feed screw-extending from.;said;guide shell; an end member securedpto therear .endof 1, 35 said housing; a feed :actuating nut .mounted on said feed screw-withinsaid end-member; a ratcheton said feed I actuating nut r a hammer member slidably mounted insaid housinglandiprm -vided withan inclined faceportion; a verticallym disposed slide -mounted insaid end member and provided with, a 'rolleradapted to-v cooperate with the inclined face.of-saidhammermember; antactuating pawl mounted onsaid slideandadapted tonengage the. teethof theratcheton .-said feed; actuating nut; a pin on;said.s1ide;-.a brake .disc

vmountedlon said .feed .screw adjacent to said feed actuating nut; .a -transversely disposed bolt mounted in said housing; -a ..bell crank .mounted on .said .bolt and adapted to cooperate with said brake .discto brake saidieedtactuating .nut and .to cooperate with said .pin .to lift saidlslide; a. lever mounted on said bolt outside said'housing; .a-lug mounted on. said lugshaft and adapted to engage saidhammer member -to prevent said;.

hammer member fromforward. movement; and

a ilever mounted .on. saidlug shaftputside-said housing.

3. 'In a rock drill, the. combination of a guide shell; a'housing slidably mounted on said-'guide shell; a feed screw extendingfrom .saidguide shell; an end member.secured...to the. rear, endof said'housing; aifeed actuating nut. .mounted on said feed screw within said end memberpa ratchet on said .feedactuatingnut; a hammermemm5 .ber slidably -mounted :in. said housing and pmvided with .an inclinedface portion; .a rack .on saidhammer member; a shaft journalled -in said housing; an intermittent gear -on said shaft adapted to engage said .rack intermittently; ta :7 spring disposed about said hammermember-within said housing; a vertically --disposed slide 'mountedrin said end'member-and provided with a :roller adapted to cooperate with the inclined face of said hammer member; ansactuatingipawl as mounted on said slide and adapted to engage the teeth of the ratchet on said feed actuating nut; a pin on said slide; a brake disc mounted on said feed screw adjacent to said feed actuating nut; a transversely disposed bolt mounted in said housing; a bell crank mounted on said bolt and adapted to cooperate with said brake disc to brake said feed actuating nut and to cooperate with said pin to lift said slide; and a lever mounted on said bolt outside said housing.

4. In a rock drill, the combination of a guide shell; a housing slidably mounted on said guide shell; a hammer member slidably mounted in said housing; a roller mounted on said hammer member; a drive shaft mounted in said housing; an intermittent cam mounted on said drive shaft and adapted to cooperate with said roller to move said hammer member rearward; a lug shaft journallel in said housing; and a lug mounted on said lug shaft and adapted to cooperate with said lug shaft to engage said hammer member and prevent forward movement thereof.

5. In a rock drill, the combination of a guide shell; a housing slidably mounted in said guide shell; a hammer member slidably mounted in said housing; a steel holding chuck provided with a ratchet and rotatably mounted in the forward 6. In a rock drill, the combination of a guide shell; a housing slidably mounted on said guide shell; a hammer member slidably mounted in said housing; a roller mounted on said hammer member; a rack on the underside of said hammer member; a drive shaft mounted in said housing; an eccentric cam, an intermittent cam, and an intermittent gear mounted on said drive shaft, the intermittent gear being adapted to cooperate with said rack and the intermittent cam being adapted to cooperate with said roller; a chuck operating lever pivotally mounted on said housing and adapted to cooperate with the eccentric cam on said drive shaft; and a chuck mounted in the forward end of said housing and adapted to be rotated by the forward end of said chuck operating lever.

JAMES C. WEIGHT. 

